The Radio Boys on Secret Service Duty

in the guide book it says 'the seals play sportively in the restless tide.' And Sut

the year, had been dissipated for an hour or more. The sky was cloudless and blue, the sunshine brilliant. A brisk breeze blew along the tremendously wide thoroughfare, which is the widest of all

big Bob, drawing in and expelling great lungfuls o

Francisco climate," said Frank. "C

said a uniforme

rawn to the curb. This was the car they had o

ght now where we want

an insp

o invented some new radio equipment, and advised me to look him up. Suppose we do that,

er the pages of a s

1453 Mission Street. Let's ask th

ng Market to the south-lay on the route to Golden Gate Park, the Cliff House and Seal R

hen the boys arrived, and, at the ringing of the bell on their entrance, a medium-sized man, brisk and aler

you, gentlemen?" he

epped f

u Mr. B

a

xtending his hand. "Here's a note from

ton the e

nod

ago on his way to Alaska I met him. He's enthusiastic about radio telephony. We had a number of very pleasant talks. I remem

troductions, and they followed Mr.

appliances, which the energetic Mr. Bender kept thrusting

n the field so far is the radio compass, but it is clumsy and unreliable. With this device, however, I am quite

e an exc

d Mr. Bender, tu

rdly conceal

work?" he a

ange sound came to the station. It might be up the coast or down, or east, southeast or northeast. Suppose it came from down the coast, or south. Then, at a point southeast of this city, we would again apply the

would be located," sa

ntent had the inventor been upon the description of his device and the method of its o

Bob glare

Mr. Bender.

intersected," declared Frank, considering it wise to withhold the whole

, project imaginary lines from each station and where

or as if, now that he had explained it

se. And here"-putting down the suitcase before the boys could examine it and taking up a finger ring from a workbench-"is the smallest rece

r a few moments while we step aside and have a little confab. I

ving them alone. "That sound detector, hey? If the Secret Servi

not be leaving for Los Angeles until tonight. I believe we ough

h him. Suppose I call Father at the office of his busine

her gets Inspector Burton to come up here, we will not be revealing anythin

saw a telephone in the store when we came i

much as necessary to

le Bob telephoned Mr. Temple, and explained they were inviti

, of course, that your invention is not in any danger of being stolen. On the contra