Stories by H. H. F. Clarke

The SciencesApril 8, 1911

Neat Method of Testing Shutter-speeds

H. H. F. Clarke

The SciencesMarch 11, 1911

Bottles Intended for Corrosive Liquids

A Good and Inexpensive Method of Labeling.

H. H. F. Clarke

TechnologySeptember 17, 1910

Serviceable Screw-Thread Corrector

H. H. F. Clarke

The SciencesMay 28, 1910

A Simple Apparatus for Emptying Carboys

H. H. F. Clarke