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Harold P Donle was a prolific inventor born in Providence, March 4th 1888 to Abner D and Miriam Donle 1. In 1913 he is listed as owning 300 watt amature radio license 1UD 20 at 18 Observatory Avenue in Providence, RI. This is right across the street from the Ladd Observatory 2.

It seems Mr Donle worked with Professor Prof. Winslow Upton of Ladd Observatory receiving time signals from the Eiffel Tower as part of a experiment used to calculate the difference in longitude between the two locations more accurately than was possible with other techniques. Winslow Upton describes how the Washington wireless signals were received at Mr. Donle’s house and compared to portable chronometer #2299 made by Charles Frodsham of London, circa 1850. 22

He was drafted into WWI in 1917 3 and although 54 he was drafted into WWII in 1942 13. Education at this point has not been established although he is listed as a student at about age 21 in the 1909 Providence street directory 14. Mr Donle held 47 Patents ranging from a Heater Pad 6 to Television 7.

In 1910 15 and 1911 16 he is listed as a Wireless Electrician. Also we see in 1911 and 1912 17 he has a younger brother who was a student at Brown University, class of 1911 21 . Then in 1914 18 and 1916 19 he is listed as working as an Electrical Engineer for Lindbridge Company, 632 Indstrial Trust Building, Providence.

Many of the patents have to do with Radio and Telephone. Companies he worked for when applying for these patents were Connecticut Telephone and Electric Company from 1917 to 1929. In 1929 his patent for a "Radiodetector" 8 is listed under RCA. Starting in 1930 his patents start being listed under Radio Inventions Inc 9 and continue to be up to 1936. In 1937 he has one patent list under just his name for "System and method for securing third dimensional effects with a single image" 10 and finally in 1937 he has two patents for "Electronic tube circuits" 11 and "Bridge circuit" 12 for the American Radiator & Standard Sanitary Corp. In his life time he lived in Rhode Island at least until 1913 when he got his amature license and then Meriden CT while he was chief engineer for the Connecticut Telephone and Electric Company. In the 1940 census he is listed as being a lodger in New York, NY. He was married to Marion Donle, also from Rhode Island, and they had 5 children. In 1909 he is also listed as having produced high class wireless instruments5 of his own design that were within the means for everyone to own ($9.00) and were powerful, efficent and finely finished receiving sets. His most interesting patent however is one for "System and method for securing third dimensional effects with a single image 10 or 3D filed in 1933 and granted in 1937!


Click to enlarge
A wireless antenna on the roof of Mr. Donle’s
house, circa 1910. Detail from a high
resolution scan of an archival glass plate
photograph. It has been digitally processed to
enhance the contrast.
Curtesy of Michael L Umbricht
Ladd Observatory Curator

Click to enlarge
The Frodsham chronometer (at right)
wired to the telegraph system.
The paper at the top of the switchboard
is labeled “Time Signals.”
Curtesy of Michael L Umbricht
Ladd Observatory Curator
.

Hi claim to fame however is his Sodium Detector as reported in the February 1923 issue of Radio Age Magazine 4.

Mr Donle died in 1942.





PUBLICATIONS

External-Anode Vacuun Tube

A New Non-Oscillating Tube

My New Noninterfering Detector

The Most Sensitive Tube In The World

The Truphonic Amplifer

A Synchronized Tuned Radio Frequency Receiver Employing Donle Truphonic System of Amplification

A New Method of Amplifier Coupling, September, 1926

The New B -6 Donle Detector, September, 1926

H P Donle Tubes

Non-Regenerative Browning-Drake
KB-8 Receiving Set



Click to Enlarge



APPARATUS


Click to enlarge
Popular Radio, September, 1925

Click to enlarge
Wireless World, July, 1925

Click to enlarge
Radio Broadcast, November, 1926

Click to enlarge
Radio Broadcast, November, 1928

Click to enlarge
Sodium Type D-21

Click to enlarge
Sodion DR-6 Battery Radio
1922

Click to enlarge
Sodion DR-6 Battery Radio
1922

Click to enlarge
Sodion DR-6 Battery Radio
1922

Click to enlarge
Sodion DR-6 Battery Radio
1922

Click to enlarge
Sodion DR-6 Battery Radio
1922

Click to enlarge
Sodion DR-6 Battery Radio
1922

Click to enlarge
Sodion DR-6 Battery Radio
1922

Click to enlarge
Sodion DR-6 Battery Radio
1922

Click to enlarge
Sodion DR-6 Battery Radio
1922

Click to enlarge
Sodion DR-6 Battery Radio
1922

Click to enlarge
Sodion DR-6 Battery Radio
1922






Click to enlarge
Sodium Rectifier



Click to enlarge
Sodium Rectifier



Click to enlarge
Donle-Bristol Detector
Type B6



Click to enlarge
Donle-Bristol Detector
Type B6

Click to enlarge
S-13 Sodium Detector



Click to enlarge
Radio Broadcast, December, 1926



Click to enlarge
Electrician and Mechanic, July, 1909



Click to enlarge
Radio News, July 1931



Click to enlarge
Brooklyn Daily Eagle
October 14, 1923

Click to enlarge
S-13 Sodium Detector Ad

Click to enlarge
S-13 Sodium Detector Ad

Type D21
From the collection of
Bill's Vintage Tube Site

Type C
From the collection of
Bill's Vintage Tube Site

Type B6
From the collection of
Bill's Vintage Tube Site

Type S14
From the collection of
Bill's Vintage Tube Site

Type S11
From the collection of
Bill's Vintage Tube Site

Type A13
From the collection of
Bill's Vintage Tube Site

Type DA2
From the collection of
Bill's Vintage Tube Site

Type A
From the collection of
Bill's Vintage Tube Site

DA4
From the collection of
Bill's Vintage Tube Site

Type DP71
From the collection of
Bill's Vintage Tube Site
Click to enlarge
Type S-13
From the collection of
Peter den Boer
Click to enlarge
Type S-13
From the collection of
Peter den Boer
Click to enlarge
Type D-21
From the collection of
Peter den Boer
Click to enlarge
Type 117, 1921
From the collection of
Peter den Boer
Click to enlarge
Type DA4
From the collection of
Peter den Boer
Click to enlarge
1919 Donle Type A
DC Detector Tube
Click to enlarge
1919 Donle Type A
DC Detector Tube
Click to enlarge
1919 Donle Type A
DC Detector Tube


PATENTS


US1240958

Condenser

US1291441

Electron-valve

US1291641

Radio communication

US1305202

Wave Meter

US1332463

Variable inductance

US1374832

Vacuum-tube base

US1415534

Variable resistance

US1420824

Rectifier

US1424809

Electric switch

US1431220

Circuit breaker

US1456267

Variometer

US1476156

Radiofrequency device

US1477868

Method and apparatus for
increasing electronic emission

US1477869

Electronic emission

US1492967

Automatic cut-out

US1509805

Telephone receiver

US1534003

Igniter governor

US1569801

Inductive coupler

US1581429

Heater pad

US1666412

Audio frequency amplifier

US1696880

Power supply

US1697829

Variable resistance

US1720824

Radiodetector

US1774494

Electric pickup

US1789673

Amplifier coupling

US1797197

Electromagnetic pick up

US1800057

Television

US1808726

Audio frequency coupling

US1815023

Amplifier coupling

US1815369

Rectifier

US1815370

Rectifier

US1822841

Magnetic pick up

US1850451

Rectifier

US1903986

Television reception

US1957101

Television method and apparatus

US1961632

Television method and apparatus

US1969456

Television scanning system

US1980155

Television

US1984336

Television method and apparatus

US1988303

Television method and apparatus

US2002992

Television method and apparatus

US2025027

Television system and apparatus

US2049897

Television method and apparatus

US2084795

System and method for securing third
dimensional effects with a single image

US2189461

Electronic tube circuits

US2189462

Bridge circuit

US1465546

INDUCTANCE

US1469295

ADAPTER

US1550789

IGNITER

US1675334

ELECTRON DEVICE

US1701840

ELECTRON DEVICE

US1745608

POWER SOURCE FOR
RADIORECEIVERS

US1701840

RECTIFIER



1 Ancestry.com

2 Licensed Amateur Stations, First Radio District, June 3, 1913

3 WWI Draft Card

4 Wireless Age, February, 1923

5 Electrician and Mechanic, July 1909

6 Heater Pad

7 Television

8 Radiodector

9 Radio Inventions Inc

10 System and method for securing third dimensional effects with a single image

11 Electronic Tube Circuits

12 Bridge Circuit

13 WWII Draft Card

14 1909 Providence, Directory

15 1910 Providence, Directory

16 1911 Providence, Directory

17 1912 Providence, Directory

18 1914 Providence, Directory

19 1916 Providence, Directory

20 1UD

21 Historical Catalogue of Brown University, 1764-1914

22 “The Magic Voice of Science”