![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151831P1-Alaska-Radio-Expedition-1915-copy.jpg)
1915 Alaska Radio Expedition??
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151824P1-Coherer-1902-copy.jpg)
Coherer, 1902
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151829P1-DeForest-3-Step-AF-Amp-1912-copy.jpg)
DeForest 3-Step Audio Frequency Amplifier
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151823P1-DeForest-4-Slide-Tuner-1904-copy.jpg)
DeForest 4-Slide Tuner, 1904
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151825P1-Early-Wireless-Shore-Station-copy.jpg)
Wireless Telegraph Installation Shore Station
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151826P1-First-Fessenden-Arc-1909-copy.jpg)
First Fessenden Arc, Used 1909-1910, and Mercury Interrupter
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151827P1-Lowenstein-Spark-Gap-1913-copy.jpg)
Lowenstein Tubular 500 Cycle Spark Gap, 1913
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151822P1-Marconi-Magnetic-Detector-1907-copy.jpg)
Marconi Magnetic Detector, 1907
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151821P1-North-Head-WA-copy.jpg)
Official US Navy Photo, North Head, WA Apparatus
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151828P1-Osc-Xfmr-Spark-Gap-1904-copy.jpg)
DeForest-Shoemaker Oscillation Transformer and Spark Gap, Used by Navy 1904-1905
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151819P1-RM6P-NPG-San-Francisco-1927-copy.jpg)
Marine Receiving Table, RM6P 5260 NPG Control, San Francisco, 1927
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151820P1-Radio-Eureka-CA-1913-copy.jpg)
Official US Navy Photo, Radio Eureka, CA, 1913
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151830P1-Telefunken-Receiver-1912-copy.jpg)
Telefunken Receiver, 1912, the First to use Litz Wire and Bank Winding
![](http://www.sowp.org/wp-content/uploads/2018/06/LR-5504151818P1-USS-Saturn-1916-copy.jpg)
Radio Room, USS Saturn, Mare Island, CA, 11 May 1916